Hi and welcome to YT.
I agree parti's and biewers are beautiful.
BUT the others are right, there is no such thing as a tea cup... this is something some breeders (usually bad ones) use to make their under sized puppies sound rare and fabulous, they also usually come with a hefty price tag and hefty vets bills.
No GOOD breeder would purposely breed for tiny dogs.
Please do more research on this.. here is a great link I found to start you off on what is the REAL truth about tea cup dogs.
The sad truth about "teacup dogs"